GASTEROPODA. 11 



litieis sndfiodu/osis irrpgularihus, inaqunlibm (9-10) cincjcndis ; apertura obliqua, columella 

 uno jjlicah. 



Shell elongated, tiirreted ; volutions numerous (about twenty), narrow, flattened, but 

 slightly contracted towards the base of each volution, and encircled witli numerous (nine 

 or ten) irregular, unequal, slightly nodulous lines ; the aperture is small, subquadratc, and 

 oblique, the colinncllar lip has a single strong i)lication. 



The volutions are narrow, so that their height is little more than the half of their 

 opposite diameters ; the upper border of each is rendered prominent by the slight contrac- 

 tion towards the base of each volution ; the single strong fold upon the pillar lip, and a 

 trace of another mesial fold upon the outer lip, is all that can be ascertained from the 

 single specimen at our disposal, which is also the type figured by Professor Phillips. 

 Sixteen volutions are preserved, but probably four more would be required to render the 

 spire perfect. Nerinaa fasciata, Voltz, approaches this species nearly, both in the general 

 figure and in the ornamentation; judging, however, from specimens obtained in the Coral Rag 

 of Yorkshire, the latter has the encircling lines more regularly disposed, and more constantly 

 and regularly nodulous ; the spiral angle also appears to be somewhat greater : it is there- 

 fore preferable to regard them as distinct species. The length of the imperfect specimen 

 above referred to is an inch and a half, to which should be added two lines to perfect the 

 spire ; the transverse diameter of the last volution is three lines. 



Geological Position and Locality, The sole example in the Scarborough Museum was 

 obtained in the Cornbrash of that locality. 



Ceritella minutissima. Lye. Tab. XLV, fig. 5. 



Tasta niirmta, elongata, spira anfractibus (4) elevatis, suhplanis ; aperura ovato-elonyata ; 

 columella contorta. 



Shell minute, elongated ; spire with the volutions elevated, smooth, and flattened ; the 

 last volution is large, moderately convex, attenuated towards the base ; the aperture is of 

 moderate dimensions, ovately elongated ; the columella is contorted at the base, as is usual 

 in the genus. 



The length of the aperture slightly exceeds one third that of the entire shell. It is 

 allied to some of the varieties of Ceritella parvula (Actaeonina), but is more subulate ; it 

 also approaches to Tuhifer Gerandoseus, Piette, but is less attenuated than the latter 

 shell. 



Geological Position and Locality. Obtained, both by Mr. Witchell and myself, in the 

 Great Oolite of Minchinhampton. 



